CN216604060U - Device for prolonging operation cycle of DMF evaporator - Google Patents
Device for prolonging operation cycle of DMF evaporator Download PDFInfo
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- CN216604060U CN216604060U CN202220027393.5U CN202220027393U CN216604060U CN 216604060 U CN216604060 U CN 216604060U CN 202220027393 U CN202220027393 U CN 202220027393U CN 216604060 U CN216604060 U CN 216604060U
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Abstract
The utility model relates to a device for prolonging the operation cycle of a DMF (dimethyl formamide) evaporator, which comprises an evaporation gas-liquid separator, wherein the bottom of the evaporation gas-liquid separator is connected with a filter, the filter is connected with the evaporator, the evaporator is connected with the evaporation gas-liquid separator, and a side line inlet of the evaporation gas-liquid separator is connected with an outlet of a DMF synthesis tower. The utility model can increase the content of the material methanol at the gas-phase short section of the evaporator, disturb the gas-phase flowing material at the gas-phase short section and reduce the scaling speed of the material at the gas-phase short section of the evaporator; the content of methanol in the materials flowing through the filter is reduced, the filtering effect of the filter is improved, the content of sodium methoxide flowing through the evaporator is reduced, the scaling speed of the evaporator is reduced, and the running period of the evaporator is prolonged.
Description
Technical Field
The utility model relates to the technical field of chemical production, in particular to a device for prolonging the operation cycle of a DMF evaporator.
Background
The information in this background section is only for enhancement of understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Sodium methoxide methanol solution is used as a catalyst in the production process of DMF, and sodium formate and sodium carbonate crystals are generated by the reaction of the catalyst with impurity water, oxygen and carbon dioxide brought by raw materials in the reaction process. Under the effect of high temperature, easily adhere to production facility inner wall, reduce equipment flow area, make material mobility worsen, cause equipment productivity to descend, need regularly wash the equipment inner wall, the cleaning process will produce a large amount of high salt waste water and cause the material loss. The crystallization phenomenon at the gas-phase short section of the DMF evaporator is the most serious, and the crystals at the gas-phase short section are not easy to clean, which belongs to the bottleneck problem influencing the long-period stable operation of a DMF (dimethyl formamide) production system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art, provides a device for prolonging the running period of a DMF (dimethyl formamide) evaporator, solves the problem that the DMF evaporator needs to be frequently transported and cleaned, prolongs the running period of the device, reduces the generation of high-salt wastewater and reduces the material loss caused in the cleaning process.
In order to achieve the purpose, the utility model adopts the following technical scheme: the device for prolonging the running period of the DMF evaporator comprises an evaporation gas-liquid separator, wherein the bottom of the evaporation gas-liquid separator is connected with a filter, the filter is connected with the evaporator, the evaporator is connected with the evaporation gas-liquid separator, and a side line inlet of the evaporation gas-liquid separator is connected with an outlet of a DMF synthesis tower.
In a typical embodiment, the bottom liquid phase discharge port of the evaporation gas-liquid separator is connected with the inlet of an evaporation circulating pump, and further, the number of the evaporation circulating pumps is multiple, and the evaporation circulating pumps are alternately used. Namely, the liquid phase material in the DMF evaporation gas-liquid separator is pressurized by an evaporation circulating pump.
In a typical embodiment, the outlet of the evaporation circulating pump is connected with the inlet of the filter, and further, the number of the filter is multiple, and the filter is provided with multiple filters which are used alternately. Namely, the liquid phase material in the DMF evaporation gas-liquid separator is pressurized by an evaporation circulating pump and then enters a filter to filter the crystal in the crude DMF liquid.
In a typical embodiment, the outlet of the filter is connected with the inlet of an evaporator, and the number of the evaporators is multiple, and the evaporators are alternately used. Namely, the crude DMF solution filtered by the filter enters an evaporator.
In a typical embodiment, the outlet of the evaporator is connected to the side inlet of the evaporation gas-liquid separator.
And a side line inlet of the evaporation gas-liquid separator is connected with an outlet of the DMF synthesis tower. Namely, the crude DMF liquid enters a vapor-liquid separator for circulation after being heated in an evaporator a or an evaporator b, and the crude DMF liquid enters the vapor-liquid separator together with the heated DMF liquid at the gas phase short joint and from the evaporator.
In a typical embodiment, the top gas-phase outlet of the evaporation gas-liquid separator is connected with the primary distillation tower, i.e. the heated crude DMF liquid is subjected to gas-liquid separation in the evaporation gas-liquid separator, and the gas-phase material enters the primary distillation tower at the top gas-phase outlet of the evaporation gas-liquid separator for further rectification and purification.
In a typical embodiment, the filter is a filter element type filter, and the solid-liquid separation effect can be improved.
In a typical embodiment, the gas-liquid separator comprises a cylinder, a cyclone separator, a foam breaking net and a blow-down valve.
In a typical embodiment, the evaporator is a circulation type evaporator, and the solution continuously circulates in the evaporator to improve the heat transfer effect and alleviate the scaling of the solution.
In a typical embodiment, the circulating pump is a horizontal circulating pump, so that the pipeline is convenient to install, and the space is saved.
In a typical embodiment, an inserted pipeline is arranged at the position where the side inlet of the evaporation gas-liquid separator is connected with the outlet of the DMF synthesis tower, and discharge ports are uniformly distributed on the periphery of the inserted pipeline.
One or more embodiments of the utility model achieve at least the following technical effects:
(1) in the traditional DMF production process, crude DMF liquid containing methanol, dimethylamine and sodium methoxide obtained by acylation reaction in a DMF synthesis tower enters a evaporation gas-liquid separator after passing through a filter. Because the crude DMF liquid contains part of methanol and the solubility of sodium methoxide crystals in methanol is high, the crude DMF liquid obtained by the reaction of the DMF synthesis tower directly enters a filter, which can cause the filtering effect of the filter to be poor, and a large amount of sodium methoxide crystals dissolved in methanol enter a vapor-liquid separator to cause the scaling of an evaporator. Therefore, the side inlet of the evaporation gas-liquid separator is connected with the outlet of the DMF synthesis tower, so that crude DMF liquid obtained by reaction in the DMF synthesis tower enters the evaporation gas-liquid separator through the side inlet of the evaporation gas-liquid separator, the content of methanol in a material flowing through the filter is reduced, the filtering effect of the filter is improved, the content of sodium methoxide flowing through the evaporator is reduced, the scaling speed of the evaporator is reduced, and the operation period of the evaporator is prolonged.
(2) In the DMF evaporation filtration system, the material flow velocity of the gas phase short section of the evaporator is minimum and the content of methanol is minimum, so the scaling of sodium methoxide at the gas phase short section of the evaporation gas-liquid separator is the most serious, which is the bottleneck problem of influencing the long-period stable operation of the evaporator. Therefore, the side inlet of the evaporation gas-liquid separator is connected with the outlet of the DMF synthesis tower, crude DMF liquid obtained by reaction of the DMF synthesis tower enters the evaporation gas-liquid separator through the side inlet of the evaporation gas-liquid separator, the content of methanol in the material at the gas-phase short section of the evaporator is increased, disturbance is formed on the gas-phase flowing material at the gas-phase short section, and the scaling speed of the material at the gas-phase short section of the evaporator is reduced.
(3) The utility model has simple structure, low cost, universality and easy large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of an apparatus for extending the operation cycle of a DMF evaporator in example 1 of the present invention.
The designations in the above figures represent respectively: 1-evaporation gas-liquid separator, 2-evaporation circulating pump a, 3-evaporation circulating pump b, 4-filter a, 5-filter b, 6-evaporator a and 7-evaporator b;
wherein A is a pipeline of a DMF synthesis tower entering a vapor-liquid separator, and B is a pipeline of a vapor-liquid separator entering a primary distillation tower.
FIG. 2 is a schematic structural diagram of a gas phase short section of an evaporator a for prolonging the operation period of a DMF evaporator in the embodiment of the utility model.
The designations in the above figures represent respectively: 1-evaporation gas-liquid separator, 6-evaporator a;
wherein A is a pipeline of a DMF synthesis tower entering a evaporation gas-liquid separator.
Fig. 3 is a schematic structural diagram of a gas-phase short section of an evaporator b for prolonging the operation period of a DMF evaporator in embodiment 1 of the present invention.
The designations in the above figures represent respectively: 1-evaporation gas-liquid separator and 7-evaporator b;
wherein A is a pipeline of a DMF synthesis tower entering a evaporation gas-liquid separator.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
Referring to fig. 1, 2 and 3, an evaporation filtration device for prolonging the operation period of a DMF evaporator. The method comprises the following steps: a filter a, a filter b, an evaporation gas-liquid separator, an evaporator a, an evaporator b, an evaporation circulating pump a and an evaporation circulating pump b.
And a liquid phase discharge hole at the bottom of the evaporation gas-liquid separator is connected with inlets of the evaporation circulating pump a and the evaporation circulating pump b, and the evaporation circulating pump a and the evaporation circulating pump b are provided one by one for alternative use.
Outlets of the evaporation circulating pump a and the evaporation circulating pump b are connected with inlets of the filter a and the filter b, and the filter a and the filter b are provided with one filter and the other filter for alternate use.
Outlets of the filter a and the filter b are connected with inlets of the evaporator a and the evaporator b, and the evaporator a and the evaporator b are provided one by one and used alternately.
Outlets of the evaporator a and the evaporator b are connected with a side inlet of the evaporation gas-liquid separator. And a side line inlet of the evaporation gas-liquid separator is connected with an outlet of the DMF synthesis tower.
And a top gas-phase outlet of the evaporation gas-liquid separator is connected with the primary distillation tower.
Example 2
An evaporation filtration device process for prolonging the operation period of a DMF evaporator is carried out by adopting the devices shown in the attached drawings 1, 2 and 3, and comprises the following steps:
performing acylation reaction in a DMF synthesis tower to obtain crude DMF liquid containing methanol, dimethylamine and sodium methoxide;
the crude DMF liquid enters a vaporization gas-liquid separator 1 at the side inlet of the vaporization gas-liquid separator, and the material in the vaporization gas-liquid separator 1 is pressurized by a vaporization circulating pump 2/3 and enters a filter 4/5 to filter sodium methoxide crystals in the crude DMF liquid;
the crude DMF liquid from which sodium methoxide is filtered by the filter 4/5 enters an evaporator, the heated material in the evaporator 6/7 is mixed with the crude DMF liquid from the DMF synthesis tower and then enters the evaporation gas-liquid separator 1, and gaseous DMF, methanol and dimethylamine enter the primary distillation tower at the top of the evaporation gas-liquid separator 1 to further refine and purify DMF.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The device for prolonging the running period of the DMF evaporator is characterized by comprising an evaporation gas-liquid separator, wherein the bottom of the evaporation gas-liquid separator is connected with a filter, the filter is connected with the evaporator, the evaporator is connected with the evaporation gas-liquid separator, and a side line inlet of the evaporation gas-liquid separator is connected with an outlet of a DMF synthesis tower.
2. The apparatus for prolonging the operation period of a DMF evaporator according to claim 1, wherein the bottom liquid phase discharge port of the evaporation gas-liquid separator is connected with the inlet of an evaporation circulating pump.
3. The apparatus for extending the operation cycle of a DMF evaporator according to claim 2, wherein the outlet of the evaporation circulating pump is connected with the inlet of the filtering machine.
4. The apparatus for extending the operation cycle of a DMF evaporator according to claim 1, wherein the outlet of the evaporator is connected with the side inlet of the evaporation gas-liquid separator.
5. The apparatus for extending the operation cycle of a DMF evaporator according to claim 1, wherein the top gas phase outlet of the evaporation gas-liquid separator is connected with a preliminary distillation tower.
6. The apparatus for extending the operation cycle of a DMF evaporator according to claim 1, wherein the filter is a filter element type filter.
7. The apparatus for extending the operation cycle of a DMF evaporator according to claim 1, wherein the gas-liquid separator comprises a cylinder, a cyclone, a foam breaking net and a blow-down valve.
8. The apparatus for extending the operation cycle of DMF evaporator according to claim 1, wherein the evaporator is a circulation type evaporator.
9. The apparatus for extending the operation cycle of a DMF evaporator according to claim 2, wherein the circulation pump is a horizontal circulation pump.
10. The apparatus for extending the operation cycle of a DMF evaporator according to claim 1, wherein an inserted pipeline is arranged at the position where the side inlet of the evaporation gas-liquid separator is connected with the outlet of the DMF synthesis tower, and discharge ports are uniformly distributed on the periphery of the inserted pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220027393.5U CN216604060U (en) | 2022-01-06 | 2022-01-06 | Device for prolonging operation cycle of DMF evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220027393.5U CN216604060U (en) | 2022-01-06 | 2022-01-06 | Device for prolonging operation cycle of DMF evaporator |
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| Publication Number | Publication Date |
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| CN216604060U true CN216604060U (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220027393.5U Active CN216604060U (en) | 2022-01-06 | 2022-01-06 | Device for prolonging operation cycle of DMF evaporator |
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